Learn Python Part 4 String Methods in Python A complete introduction

Published: 10 May 2020
on channel: Bioinformatics and Computational Biology

291

This Video will cover the following topic:
String Methods
Changing the capitalizations of a string
Stripping the string
Reversing a string
Split a string
Replacing the occurrence of one substring with a new substring
Testing what a string is composed of
Format values into a string
Join a list of string
Test the starting and ending of string
String Module

CODE::
#String Methods
#Changing the capitalizations of a string
#str.upper
#str.lower
#str.capitalize
#str.title
#str.swapcase

s = 'This IS a String'
print('Upper case: ', s.upper())
print('Lower case: ', s.lower())
print('capitalize case: ', s.capitalize())
print('Title case: ', s.title())
print('Swape case: ', s.swapcase())

#Stripping the string
#str.strip
s = 'a line with leading and trailing space '
print("stripped string: ", s.strip())
s = "---a python prompt"
print("Stripped string: ", s.strip('-'))

Reversing a string
s = "hello"
print(reversed(s))
print("".join(reversed(s)))

Split a string
s = "this is a string"
print(s.split(' '))
s = 'this is a sentence'
print(s.split('e', maxsplit=1))
print(s.split('e', maxsplit=2))

Replacing the occurrence of one substring with a new substring
s = "Make sure to foo your sentence."
print(s.replace('foo', 'spam'))
s = "It can foo multiple examples of foo if you want."
print(s.replace('foo', 'spam'))
s = "It can foo multiple examples of foo if you want or you can limit the foo with the third argument"
print(s.replace('foo', 'spam', 1))

#Testing what a string is composed of
#str.isalpha
s = "Hello World"
s1 = "Hello2World"
s2 = "HelloWorld!"
s3 = "HelloWorld"
print("s: ", s.isalpha())
print("s1: ", s1.isalpha())
print("s2: ", s2.isalpha())
print("s3: ", s3.isalpha())

#str.isupper
s = "hello world"
s1 = "HELLO WORLD"
print("s: ", s.isupper())
print("s1: ", s1.isupper())

#str.islower
s = "hello world"
s1 = "HELLO WORLD"
print("s: ", s.islower())
print("s1: ", s1.islower())

#str.isdigit
#str.isnumeric
#str.isdecimal
#str.isspace

#Format values into a string
i = 10
f = 1.5
s = "foo"
l = ['a', 1, 2]
d = {'a': 1, 2: 'foo'}
print("{}{}{}{}{}".format(i,f,s,l,d))
print(str.format("{}{}{}{}{}", i , f , s, l, d))
s = "I am from Australia. I love cupcakes from Australia!"
print("I am from {}. I love cupcakes from {}!".format("Australia", "Australia"))
print("I am from {0}. I love cupcakes from {0}!".format("Australia"))

#Join a list of string
l = ["once", "upon", "a", "time"]
print("----".join(l))

#Counting number of times a substring into a string
#str.count(sub[,start[,end)
s = "She sells seashells by the seashore."
print(s.count("sells"))

Test the starting and ending of string
#str.startswith
#str.endswith
s = "this is a test string"
print(s.startswith("t"))
print(s.startswith("T"))
print(s.endswith("ing"))

String Module
import string
print(string.ascii_letters)
print(string.ascii_lowercase)
print(string.ascii_uppercase)
print(string.digits)
#string.digits
#string.hexdigits
#string.octaldigits
#string.punctuations
print(string.printable)

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